Asynchronous https firebase functions

Question

Should HTTPS functions return asynchronous promises like realtime functions have to? We haven\'t been returning in HTTPS functions (just using res.status.send etc), and it l

Answer 1

Your cloud functions should return"end" with either of the following

res.redirect(), res.send(), or res.end()

What they mean by returning promises, is lets imagine you have a cloud function that updated a node in your realtime database, you would like to complete that work before responding to the HTTP request.

Example code

let RemoveSomething = functions.https.onRequest((req, res) => {
    cors(req, res, () => {
        // Remove something
        DoDatabaseWork()
            .then(function (result) {
                res.status(200).send();
            })
            .catch(function (err) {
                console.error(err);
                res.status(501).send();
            });
    });
});

Update: Added DoDatabaseWork example.

const DoDatabaseWork = function () {
    return new Promise(function (resolve, reject) {
        // Remove SomeNode
        admin.database().ref('/someNode/').remove()
            .then(function (result) {
                resolve();
            })
            .catch(function (err) {
                console.error(err);
                reject();
            });
    });
}